<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>main</title>
</head>
<body>
Welcome
<%
Object obj=session.getAttribute("login_name");
String login_name=obj.toString();
out.print(login_name);
%>!
<ul>
<li><a href="show.jsp">show all information</a></li>
<li><a href="alter.jsp">alter your interst</a></li>
<li><a href="login.jsp">logout</a></li>
</ul>
</body>
</html>